Category in 2 columns

[mid0ri]

I need to display sub-categories in two columns like this:
Category: RealVideo
  Food             Nature
  Multimedia     User galleries

I modified the following project_vii theme.php as follows

Code Select Expand

<!-- BEGIN catrow -->
  <tr>
    <td class="tableb" width="28%">
      <table border="0">
        <tr>
          <td>{CAT_THUMB}</td>
          <td><span class="catlink"><b>{CAT_TITLE}</b></span>{CAT_DESC}</td>
        </tr>
      </table>
    </td>
    <td class="tableb" align="center" width="9%">{ALB_COUNT}</td>
    <td class="tableb" align="center" width="9%">{PIC_COUNT}</td>
    <td class="tableb" width="30%">
      <table border="0">
        <tr>
          <td>{CAT_THUMB}</td>
          <td><span class="catlink"><b>{CAT_TITLE}</b></span>{CAT_DESC}</td>
        </tr>
      </table>
    </td>
    <td class="tableb" align="center" width="9%">{ALB_COUNT}</td>
    <td class="tableb" align="center" width="9%">{PIC_COUNT}</td>
  </tr>
  <tr>
    <td class="tableb" colspan="3">{CAT_ALBUMS}</td>
    <td class="tableb" colspan="3">{CAT_ALBUMS}</td>
  </tr>
<!-- END catrow -->

Consequently, the same sub-categories are repeated twice on the both columns:
Category: RealVideo
  Food               Food
  Nature       　　　Nature
  Multimedia        Multimedia
  User galleries     User galleries

Is there someone who is kind enough to help me to correct the HTML code above? Is there any other php files that I need to edit?

Thanks in advance,
midori